Add ID-based filtering to search-memory and export-memory

[Copilot]

Add search-memory and export-memory by ID capability

This PR implements the ability to search and export memories by ID, enabling quick batch operations for LLM workflows.

Completed:

• Add ids parameter to search-memory tool (MCP schema + CLI)
• Add ids parameter to export-memory tool (MCP schema + CLI)
• Implement ID-based search in MemoryService.search()
• Update ExportFilters type to support ids parameter
• Update export executor to handle ID filtering
• Update all existing search() calls to match new signature
• Verify existing tests still pass
• Add comprehensive tests for search-by-id functionality
• Add comprehensive tests for export-by-id functionality
• Fix CLI parser to handle single ID values
• Manually test CLI commands with new parameters
• Update README and CHANGELOG documentation
• Run security scan with codeql_checker (0 alerts)
• Refactor ID search logic to use private helper method

Summary:

✅ All 15 tests passing
✅ No security vulnerabilities detected
✅ Documentation updated
✅ Manual CLI testing successful
✅ Code refactored per review feedback

The feature is complete and ready for use!

Original prompt

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This section details on the original issue you should resolve

<issue_title>search-memory, export-memory by id</issue_title>
<issue_description>We should allow an optional search by id to allow quick batch operations.
Use case: Wanted to export a set of memories but query was limited to text or tags and not all memories matched.

Allowing by id allows the llm to create a batch of ids that can be used to export or search.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes search-memory, export-memory by id #28

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[chrisribe]

@copilot please use this.stmts pattern add this query there so everything is in the same place